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Ms. Mary Meays Page 2 .July 15, 1991 10 to 15 feet. The remainder of the boring, from 15 to 30 feet, was filled with sand. Both wells were secured with traffic boxes at the ground surface. Standard ERM-West, Inc. Quality Assurance/Quality Control (QA/QC) procedures were followed throughout the construction process. All The were decontaminated by steam cleaning p tdrilling each split spoon sampler was decontaminated prior to each use by washing in an Alconox solution followed by a clean water rinse. The brass tube liners for the sampler were similarly cleaned prior to use. The well casing and screen were cleaned and decontaminated by steam cleaning prior to use. Soil cuttings from each boring were placed in labeled 55-gallon drums and stored on site. Well Development gnd Water Eampliag Following construction, the new wells were developed by hand-bailing approximately 15 to 18 gallons (or 12 to 13 well volumes) from each well. The bailing was continued until temperature, pH, and conductivity stabilized, and the silt content of the discharge water declined markedly (Table 1). The pre-existing wells were purged by bailing a similar volumcr 'if water. QA/QC procedures were followed during development and purging. Price to work at each well, the bailer was cleaned and decontaminated with an Alconox solution followed by a clean water rinse. Bailer cord was replaced in between sampling at each location. Bailed water and water from the decontamination procedures was contained in 55-gallon drums and stored on site. After development and purging procedures were completed, all wells were sampled. The wells were sampled with a pre-cleaned Teflon bailer equipped with a removable petcock. Water was transferred from the bailer into laboratory-supplied bottles. All samples (water and soil)provided to the laboratory were labeled and sealed individually in zip-lock type plastic bags, then placed on ice in a cooler. Soil and Water Analyses J The soil and water samples were submitted to Curtis &Tompkins, Ltd., a California Department of Health Services (DHS) certified laboratory located in Berkeley, California. The samples were shipped under chain-of-custody and analyzed according to the following test procedures: • Total Petroleum Hydrocarbons as Gasoline EPA Method 8015- - Modified;